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How to get Users Screen Resolution with PHP and Javascript

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Get Screen Resolution with PHP - Javascript Pag 1

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The only way to grab users screen resolution is via Javascript and there is not way to get it using only PHP as far as I know!!
Well,nothing new,but the trick is interacting between the 2 programming languages and get the job done. It seems quite easy just checking whether the cookie has been set and ,if not found, set it using Javascript and then refreshing the page and retrieve it with PHP,but what is going to happen if the user has Cookies disabled ? The code would start an infinite loop refreshing the page over and over again because , obviously the cookie can't be set.To avoid all this,the trick is starting the Session and check a value stored in a Session variable and preserved when refreshing the page,if this value is set it is the second loop and therefore we can go on reading the cookie whether it is set or not. Let us see the code:

First row,we start Session session_start()

then we check if $_SESSION[iterate] has been set,if not we check whether the cookie is set if(!isset($HTTP_COOKIE_VARS["users_resolution2"])) if cookie is not found set $SESSION[iterate]=1 and the cookie using Javascript <script language="javascript">
<!--
writeCookie();

function writeCookie()
{

var the_cookie = "users_resolution2="+ screen.width +"x"+ screen.height;

document.cookie=the_cookie
and then refresh the page location ='<?php echo $_SERVER['PHP_SELF'];?>';

Refreshing the page,this time $_SESSION[iterate] has been set,and the code goes straight to retrieve the value from the cookie and if it's empty or unset it won't cause an infinite loop .

Here the code,you can copy and paste it for a test.The name of the file is get_resolution.php

<<?php
session_start();

if (!isset($_SESSION[iterate]))
{
if(!isset($HTTP_COOKIE_VARS["users_resolution2"]))

//means cookie is not found set it using Javascript
{
$_SESSION[iterate]=1;
?>
<script language="javascript">

</script>
<?php
}
else{
$screen_resolution = $HTTP_COOKIE_VARS["users_resolution2"];
}
}
else{
$screen_resolution = $HTTP_COOKIE_VARS["users_resolution2"];
}
echo $screen_resolution;
?>

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How to get Users Screen Resolution with PHP and Javascript

Get Screen Resolution with PHP - Javascript Pag 1

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